Continuous pulp-beater



S. MITCHELL.

CONTINUOUS PULP BEATER. APPLICATION FILED AUG. 23, 1919.

wsaq ww Patented June 7, 1921.

2 SHEETSSHEET I.

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S. MITCHELL.

CONTINUOUS PULP BEATER.

APPLICATION FILED Aue.23, 1919.

Patented J mm 7, 11923,

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INVENIOR ,dy t yifimail) 6" ATTORNEYS combinations of the FATELNT @FFWE.

SIDNEY MITCHELL, OF NEW YORK, N. Y.

CONTINUOUS PULP-BEATER.

Specification of Letters Patent.

Patented June Z, 1921.

To (all vii/ m it may concern:

Be it known that I, SIDNEY MITCHELL, a citizen of the United States, residing at, New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Continuous Pulp- Beaters; and I do hereby declare the following to be a full, clear, and exact description of the invention. such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

The present invention relates, generally, to improvements in pulp beating machines commonly employed in the paper manufacturing industry; and the invention has reference, more particularly, to an improved construction of beater adapted to beat and tease out the fibers of the raw material to produce a proper pulp requisite to the carrying on of papenan-d straw board manufacture.

The invention has for its principal object t provide an improved and'simplified construction of continuous pulp beating machine of the general type described in my prior Letters-Patent dated September 3, 1918, and numbered 1,277 ,628.

The invention has for a further objectto. provide an improved arrangement and construction of pulp separating screens or gratings through which the finished pulp passes, during the operation of the machine, to the discharge trough. v ()ther objects of the present invention, not at this time more particularly enumerated, will be clearly understood from the following detailed description of the same.

The invention consists, primarily, in the novel construction ofcontinuous beater hereinafter' set forth; and the invention consists, furthermore, in the novel arrangements and various devices and parts, as well as in the details of the construction of the said parts. all of which will be hereinafter more fully described, and then finally embodied in the appended claims.

The invention is clearly illustrated in the accompaning drawings, inw. ich

Figure l is a plan view of a pulp beater made according to and embodying the prin ciples of my present invention, a portion of the hood inclosing the beater roll being.

broken away.

Fig. 2 isja vertical longitudinal section of the same, taken on line 2-2 in said Fig. 1. Fig. 3 is a vertical transverse section of the same, taken on line 33 in said Fig. 2.

Fig. 4 is a detail view of the main separating screen or grating, drawn on an enlarged vployed in all of the hereinabove described views, to indicate corresponding parts.

Referring now to said drawings, the reference character 1 indicates the usual beater tub in which the beater mechanism and the novel separating devices are mounted, and in which the raw material to be pulped,and the water for softening the same and assisting its circulation around the tub to the beater roll, is deposited. Arranged within the tub is the usual midfeather 2 which terminates short of each end of the tub, and which serves to properly divide the tub to provide the desired continuous circulatory passage therein. Mounted between one side wall of said tub and said mid-feather 2 is the usual beater roll 3, having a series of radially projecting fly-bars 4 on its circum-. ference. A transversely journaled driving shaft 5 is mounted in connection with said tub upon which the roll 3 is fixed, said shaft being provided with a suitable belt pulley 6, or other suitable means for driving the same. Arranged beneath said beater roll 3 is any desired form of base-plate 7, with which the beater roll cooperates in beating out the raw material into the required pulp. Extending over the exposed portion of the beater roll 3 is inclosing hood 8, having a portion substantially cdncentric to the circumference of the beater roll, and in the forward end of which is provided a transverse discharge opening 9. Arranged exteriorly in front of and beneath said discharge opening 9 discharge trough or conduit 10 which may extend in slight downwardly sloping inclination to and beyond either side of the tub 1 as may be desired.

Secured within said hood 8, so as to extend between the side walls of the latter, and so as tobe positioned within and at the rods or'bars 12 are spaced apart so as to provide a series of narrow intermediate interstices 13, which under ordinary condi tions maybe from one-quarter to one-half inch. in width. Said rods or bars 12 may be either secured to said supporting members so as to be either rigidly related thereto or capable of a limited vibratory swing or oscillation from their point of attachment to said supporting; member, although I prefer the latter method of mounting; the same,

since the slight vibration or movement per;

mitted by such mounting tends to more easily and quickly dislodge unmasti-cated or insuificiently pulped portions of raw material which may be hung against the bars, and consequently provides a better assurance against clogging of the intermediate interstices 13. I have shown in the drawings, and more particularly in Figs, 4- and 5, one method of securing the rods 12 to the supporting member 11. This method con sists inproviding each rod with a tailpiece 14 which is inserted through openings 15 in said supporting member 11, after which the upwardly projecting end of the tailpiece is provided with a head 16, by riveting over the same, or in any other desired manner. It vibratory play is to he allowed to the rods, the openings of the supporting member 11 are made slightly larger in. diameter than the diameter of the tail-piece 14c.

Secured Within said hood 8 intermediate said above-described main grating or screen and the beater roll 3 are one or more auxiliary or secondary gratings or screens, each comprising a transverse supporting member 17 to which are secured a seriesof rigidly depending: bars or rods 18, the latter being more widely spaced apart than are the bars 12 of the main screen or grating, so as to provide relatively wider intermediate interstices 19; The lower free ends of said bars or rods 18 are curved outwardly away from the beater roll 3-so asto assure against any possible contact of thefly-bars l oi the roll therewith, which might result in. injury to either the former or the latter.

In operating the device the tub 1 is filled with water and the raw material to be pulped is deposited therein. The heater roll 3 is then set in motion. The rotation of the beater roll acts as a paddle upon the Water in thetub, causing the same to circulate around the tub in. the path defined by the walls of the tub and the mid-feather 2.

, tion andmastication therein.

The circulatory flow of the water thus set up carries the raw material between thev heater roll and the base-plate 7 in the usual manner, thereby causing the reduction of the raw material into a fibrous mass, which with the water in which it is carried pro-- duces the pulp desired. The nature of the raw material is such that almost immediately some portions thereof are reduced. to the necessary pulpy mass, while other portions, being more resistant, are not so re-- duced until during the circulation through the tub they are carried many times into contact with the beater roll. During the operation of the beater the. properly reduced or pulped portions of the raw material are, in a large part, separated from the more resistant mass and discharged continuously from the hood ready for use, leaving the more resistant mass for further treatment, until it too is gradually reduced and discharged. This separation is effected as follows: During the rotation of the beater roll 3 a certain amount of waterand pulped raw material is carried around with the same, a

the pulp being. thrown outwardly by centriitugal force from the circumference of the beater roll. The outwardly precipitated portions of pulp are thrown, toward the auxiliary or secondary screens or gratings, and thereupon pass through the comparatively Widely spaced interstices 19 between the rods or bars 18 thereof, and are thence thrown against the main grating-or screen formed by the'relativ'ely closely spaced bars or rods 12. iii any raw material not properly reduced, strings, or other non-pulped ma,- ternil are thrown oil by the beater roll 3, v

the same are in most instances caught by sensor the other of the said auxiliary or secondary screens or gratings, and held back until, under the action of g'avity, they drop back into the tub for further circula- Such pulped material as passes the auxiliary or secondary screens is thrown against the main screen or grating, and if properly reduced to a fine enough condition, passes through the inter stices of the same, and thence through the discharge opening i) so asto fall into the discharge trough 10, being thence discharged from the beater machine,

are

material as is still too coarse to pass through the interstices of said main screen or graft ing, and which is consequently not su hi;-

main screen or grating, so that the un- Y pulped material lodged thereon would 'be' thereby aided in slipping down-by gravity I the tub.

and ar screens in Y centritu all force from the rotatmg beater roll in company with the pulped material. to maintain the screen in suihciently wetted down condition to assure the quick and requisite falling or slipping down of insuliiciently pulped material under the pull of gravity, thus greatly simplifying and cheapening the construction of the heater. 1 also find that the bars 12 of the main screen will readily clear themselves of the un-pulped mate-rial even though they are rigidly secured, although not quite so rapidly as when said rods are permitted to oscillateor vibrate slightly under the impact of the outwardly flying pulp, therefore, generics-l y, I consider the present invention to includes screen in which the rod elements are either rigidly fixed or free to vibrate slightly, I have made the further discovery at, when the rods are permitted to vibrate or oscillate in connection with their supporting means, a more rapid clearing of unpulped material is eil'eoted, it the rods are movable independently of each other, rather ran movable in fixed groups as in my aforeaid earlier patent. In some classes of work he auxiliary or secondary screens may be 'ispensed with, the main scr e serving \llidently to cause the due separation of ,ulpcd and un-pulped material. All the above-mentioned advantages are the result of the simplified construction illustrated and described in this application, and then inaily set forth in the appended claims.

My present construction of heater is continuous in operation, and consequently as the v material is reduced in quantity by discharge from the heater in the form of p operly puipcd material, additional quanof raw material may be deposited in in tub from time to time without necessity of stopping the beater, or of interrupting the pulping and continuous discharging action of the same.

I am aware that some changes may be made in the bezel arrangements and combinati or the devices and parts, as well tlii etaiis of the construction of the at departing from the scope of vention as described in the fication, and as defined in the Hence, 1 do not (1 hereto. mtion to the exactarrange :M. i "*1 i and combinations ot the devices-and parts as set forth in the vforegoing specification, nor do I confine myself to the exact details of the construction of said parts as illustrated in the accompanying drawings.

I claim i 1. In a device of the kind described, a tub; a heater roll therein; a hood inclosing said beater roll having a discharge opening therein, a grating comprised of closely spaced rods interposed between said dis; charge opening and said heater roll, and a discharge trough exteriorly arranged relative to said discharge opening to receive pulp discharged through said grating by centrifugal force from said beater roll.

2. In a device of the kind described, a tub; beater roll therein; a hood inclosing said beater roll having a discharge opening therein; a grating interposed between said discharge opening and said beater roll, said grating comprising a series of substantially perpendicular rods spaced apart to provide intermediate narrow interstices, and means for supporting saidrods; and a discharge. trough exteriorly arranged relative to said discharge opening to receive pulp discharged through said grating by centrifugal force from said beater roll.

8. In a device of the kind described, a tub; a. heater roll therein; a hood inclosing said beater roll having a discharge opening therein; a transverse supporting member fixed in said hood in the rear of said'discharge opening, a series of depending closely spaced rods attached to said supporting member to extend downwardly across the area of said discharge opening forward of said beater roll, means for connecting said rods with said supporting member so that each rod is capable of an independent oscillatory movement relative to said supporting member, and a discharge trough extetherein; a grating interposed between said discharge. opening and said heater roll, said. grating comprising a series of substantially perpendicular rods spaced apart to provide intermediate narrow interstlces, means for supporting said rods so that each rod is capable of an independent oscillatory move-- ment, and a discharge trough exteriorly arranged relatlve tQSald discharge OPBIIIDO.

5. In a device of the kind described, a 1

tub; a heater roll therein; a hood inolosing said heater roll having a discharge opening therein; a grating interposed between said discharge opening and said heater roll, said grating comprising a series of substantially perpendicular rods spaced apart to provide intermediate narrow interstices. means for supporting said rods so that each rod is capable of an independent oscillatory movement, an auxiliary grating comprising a seriesof substantially perpendicularmods spaced more Widely apart, means for supporting said latter rods between said first mentioned grating and said beater roll, and

. iessmeeo 21 discharge trough exteriorly arranged i'ela- 10 tive lZOSELlCl discharge opening.

In testimony that I claim the invention set forth above I have heieu'nto set my hand this 20th day of August, 1919., t

SIDNEY MK'ICHELL. Witnesses:

G vee D. Rio/times,

HANSEN. 

